Matt Mullenweg, 32
More than a quarter of the web runs on WordPress’s blogging software. Although the Texas native has built a healthy business out of parent company Automattic—it now has 500 employees and its first marketing chief and recently raised $160 million at a $1 billion–plus valuation—he’s focused on the long term, he says. That’s why he’s doing his best to avoid an IPO (for now at least) and continues to run the WordPress Foundation, whose mission is to keep the blogging software freely available to all. Fun fact: He’s a fan of qwerty keyboard alternative Dvorak.